运载火箭铝合金贮箱全搅拌摩擦焊接工艺及应用

搅拌摩擦焊技术具有焊接缺陷少、焊接变形小、接头性能高等优点,是运载火箭铝合金贮箱制造的发展趋势。本文分析了我国运载火箭贮箱的结构组成和主焊缝结构特点,系统梳理并研究了实现贮箱主焊缝全搅拌摩擦焊接制造所需要的关键技术,包括常规搅拌摩擦焊技术、可回抽搅拌摩擦焊技术、超声相控阵检测技术及补焊技术。研究成果已经逐步实现了在运载火箭贮箱筒段纵缝、箱底主焊缝、贮箱总装环缝上的工程化应用。

Application of All Friction Stir Welding Technology on the Launch Vehicle Tank

Friction stir welding technology has become the manufacturing trend of launch vehicle aluminum tank due to the characteristics of less weld defects, small welding deformation, high joint performance, and so on. This paper analyzes the rocket tank structure composition and the main weld structure characteristics, and systematically studied all the key technologies used to realize the all-friction-stir-welded tank manufacturing, including conventional friction stir welding technology, phased array ultrasonic inspection technology and repair welding technology. The results of this paper has been gradually applied to the longitudinal weld, the main weld of the dome, and the circumferential weld of the launch vehicle tank.